[@CConley25]

@CConley25 asked the Naked Scientists:
   
Who will release more greenhouse gases today [the day of the royal wedding]: the US by launching shuttle, or the UK by parading all of those horses around?

What do you think?

[Bored chemist]

Horses are carbon neutral.

[CliffordK]

More than half of the fuel on the shuttle is Hydrogen & Oxygen that is not currently considered to be a greenhouse gas, although the question would be what energy source was used to manufacture the 2H2+O2. 

I didn't see the wedding.  How many people traveled to England from afar?  Private jets?  Military Jets?  Do you count TVs?

I suppose the preparation and support for the shuttle launch was quite extensive too. 

Overall, it was probably a wash.